Perhaps you should try some spelling variations:
ve thanh » le thanh, den thanh, ha thanh
de thanh » le thanh
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ve cap » ve cac, le cap, ve cai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty xang xa hoi. hieu ve cap cuu ((ve thanh) or (de thanh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty xang xa hoi. hieu ve cap cuu ((ve thanh) OR (de thanh)) dai cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ty xang xa hoi. hieu ve cap cuu ((ve thanh) or (de thanh)) dai cua tre*.